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Alarm Valves and Dry Pipe Valves > Alarm Valves And Dry Pipe Valves > Flashcards

Alarm Valves And Dry Pipe Valves Flashcards

1
Q

What are the primary functions of Alarm Valves

A

-Act as check valves
-Initiate alarm signal
-Provides gauge port and signal switch ports
-Provides means of draining system

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2
Q

Will a paddle flow switch operate a WMG?

A

-No

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3
Q

What can the electrical signal from an alarm switch operate?

A

-Fans/exhaust
-Close doors
-Electric bell and buzzers, horns, and strobes

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4
Q

An audible alarm must be heard within how long of activating and alarm device?

A

5 minutes.

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5
Q

What is the monitor for the sprinkler system monitoring?

A

-Common Trouble
-Supervisory
-Alarm

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6
Q

Piping between the sprinkler system and the pressure actuated alarm initiating device shall be …

A

-Galvanized or non-corrosive
-not less than 3/8”

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7
Q

What is the minimum size drain for the alarm line piping’s restricted orifice to drain into?

A

1/4”

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8
Q

What types of sprinkler systems can a paddle flow switch be installed on?

A

Wet systems

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9
Q

What does the PS 10 switch typically monitor?

A

The Alarm line.

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10
Q

What does the PS 120 switch typically monitor?

A

System water pressure.

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11
Q

What does the PS 40 switch typically monitor?

A

System air pressure.

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12
Q

What are the three wet alarm valve seat types?

A

-Split or Groove Seat
-Pilot Port
-Divided Ring

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13
Q

Piping for WMG must be…

A

Minimum 3/4” and non-corrosive.

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14
Q

What is the max vertical distance a WMG can be from an alarm valve?

A

20’

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15
Q

What is the max horizontal distance a WMG can be from an alarm valve?

A

75’

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16
Q

If multiple alarm valves are piped to a single WMG, what must be installed on each feed line?

A

A check valve

17
Q

Where is the excess pressure pump’s relief valve installed?

A

Directly connected to the discharge piping of the EPP.

18
Q

Where does the retard chamber vent its air through?

A

Through the WMG or a vent on the discharge side.

19
Q

True or False.

Every wet pipe system must be protected by a listed relief valve?

A

True

20
Q

What is the minim size of a relief valve protecting a wet pipe system?

A

1/2”

21
Q

At what pressure is the relief valve on a wet pipe system set to operate?

A

175psi or 10psi greater than working pressure of the system, which ever is greater.

22
Q

What are the types of Dry Pipe Valves?

A

-Differential
-Latching Differential
-Mechanical
-Low Pressure Differential

23
Q

How much water must be trapped for a drum drip to be installed?

A

5 Gallons

24
Q

Systems with manual air maintenance must have…

A

A relief valve.

25
Q

What are the components of an air maintenance device in order?

A

-Quick fill valve
-N.O. Air supply control valve
-Strainer
-Union
-Regulator
-Check Valve
-Restricted orifice

Alarm Valves and Dry Pipe Valves (2 decks)

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